Obstetric ultrasound.
D002170:Canada; D002983:Clinical Competence / Q000592:standards; D003406:Credentialing / Q000592:standards*; D004502:Education, Medical, Continuing / Q000592:standards*; D005260:Female; D006801:Humans; D009774:Obstetrics / Q000193:education* / Q000592:standards; D011247:Pregnancy; D011871:Radiology / Q000193:education* / Q000592:standards; D012955:Societies, Medical; D016216:Ultrasonography, Prenatal / Q000592:standards*; D014481:United States